This
patch is for the 2005 Standard Edition (18+). Make sure you're in Japanese
locale before starting. Install your copy of the game, then download the patch.
Double click the exe, and let the installer do its thing. AIR will now be in
English. Enjoy!

(Please
make sure you’re installing the patch over a clean install of the game. You may
encounter bugs otherwise.)

3) Once
all three rars are downloaded, right click the file labelled 'part1' and
extract. This will extract from all three parts and merge them together. You
don't need to use hj split or anything.

4) Find
the file labelled 'KOE' in the files you just extracted. Move that folder (and
just that folder, with the contents inside. Not just the contents, or any other
folder called anything else) into your game directory.

5) Our
patch does the rest. You should have voices now! If you ever want to remove them,
just rename the KOE folder.